The low energy spectra of gamma-ray bursts

Details The low energy spectra of gamma-ray bursts The low energy spectra of gamma-ray bursts

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aipc...77..189b&link_type=abstract

In: Gamma ray transients and related astrophysical phenomena; Proceedings of the Workshop, La Jolla, CA, August 5-8, 1981. (A83-

Physics

21

Energy Spectra, Gamma Ray Bursts, Bremsstrahlung, Continuous Spectra, Cyclotron Radiation, Electron Scattering, Gamma Ray Spectra, Positron Annihilation

Scientific paper

The implications of observed gamma-ray burst spectra for the physical conditions and geometries of the sources are examined. It is noted that an explanation of the continua in terms of optically thin thermal bremsstrahlung requires a relatively large area but a fairly shallow depth. On the other hand, a spectrum similar to that observed could be produced by rapid flickering of sources with less extreme geometries if each flicker emits a Comptonized thermal spectrum. Either field inhomogeneities or plasma motions are required to interpret the low energy features as cyclotron extinction. An alternative explanation is photoelectric absorption by heavy atoms; this requires a field strength high enough to make one-photon electron positron annihilation possible. Observational tests of these possibilities are proposed

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